Specification and Classification of Pelletised Dried Sewage Sludge: Identifying Its Key Properties as a Renewable Material for Enabling Environmentally Non-Harmful Energy Utilisation

Renewable active sludge is a smart material for wastewater treatment and the protection of surface water bodies. The generated pellets (dried pelletised dehydrated anaerobically stabilised excess sludge) are produced in quantity 31.4 ± 5.6 g dry matter (DM) per one Population equivalent (PE) calculated to COD (PECOD) day. As combustible material, their energy utilisation must reach sustainable development goals (SDGs)—a bridge be created between “treated sewage as tool remove pollutants nutrients from wastewater” “preparation valuable solid recovered fuel (SRF) that meets customer-specific requirements”. Technical Report CEN/TR 15508 Standard EN ISO 21640 set up methods specifying classifying an SRF. In last eleven years (2010–2021), pellets’ net calorific value (NCV) 13.0 0.7 MJ kg−1 received (ar). 2021, 80th percentile Hg/NCV ratio was 0.079 mg Hg MJ−1. 2010–2021, annual amount transferred stakeholders reduced by 64.3% m/m—from 10.1 kg 3.67 kg. halogen contents do not threaten corrosion incineration facility. Stable potential perspective ash composition critical raw materials recovery qualify specific waste stream renewable SRF production.